Air-feeding apparatus for furnaces.



Patented sept. 9, |902.`

2 Sheets-Sheet I.

\ No.- 708,35l." Hg-v ABBOTT. v

'Am FEEDING APPARATUS Pon FUBNAGES. (Application med' Nov. 6, 1901. i (no Model.)

No, 7s,a5|. Patented sep-t. 9, mozI H. ABBOTT. AIR FEEDING APPARATUS FOB FURNACES.

(Application med Nav. e, 1901.)

(No Model.) 2 Sheets-$-het 2.

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UNITED STATES? PATENT AOlurrcE.

WALES,

AIR-FEEDING APPARATUS; FOR FURNACES.`

SPECIFICATION forming part of Letters Patent No. 708.851, dated September 9, 1902.

' l Application filed November 6, 1901. Serial No. 81,357. (No model.)

setting, though it may be applied to otherfurnaces which have what are termed combustion-chambers, through which may pass a passage or pipes direct from air to the ashpit and furnace, and it has been devised particularly that thorough combustion willtake place in the furnace, and so prevent the emission of smoke; but in order that this invention may be clearly understood reference will notsr be made to the drawings herewith.

Figure 1 is a central sectional view in per-V spective of a steam-boiler and its setting, to `which is applied the presentinvention. Fig. 2 is a similar View in which partsof'this invention are of modified construction.

The boiler 1 is set in brickwork 2, with suitable fluesleading from the furnace 3 to the chimney 4, and has all necessary connections,

well understood and therefore not illustrated.

The furnace 3 has feeding-doors 5, fire-bars 6, and rebridge 7, while its ash-pit 8 is closed or air tight and has cleaning out doors 9. i

In the construction shown in Fig. 1 at the back of the chamber 10 (usually called the combustion-chamber) andwith asV thin a partition as practicable is a downtake-passage 11. From the bottom of this passage a series of pipes 12 lead along the bottom of saidV chamber 10 through the bridgev' to close under the fire-bars 6, where they have three rows of perforations. From the steam-chamber a steam-pipe 13 leads to the front of the boiler and has abranch 14, provided at a convenient position with a regulating-valve 15. From this Vvalve a pipe 16 returns to the crosspipe 17 above the downtake 11. This crosspipe 17 has a series of perforations 18 (or may have a series of nozzles) at the mouth of the downtake. It will be seen that steam being vallowed by manipulation of the valve 15 to escape or blow into the downtake 11 air will be sucked therein and a strong draft created. The air, thoroughly heated in its ypassage through downtake 11 and pipes 12, will thus be discharged under the lire-bars 6 and passing through them will promote most effective combustion and practically prevent or nearly prevent the emission of smoke from the fuel. As an additional precaution a pipe or pipes, (if preferred, made of iireclay,) only one being shown as used in Fig. 1 and marked 19, passes downwardly through chamber 10 over the bridge 7 into the furnace 3 above the firebars 6 and has bell-mouth pointing forwardly. A jet 2O is set-above the mouth of this pipe 19, steam being conducted thereto by pipe 21 from a regulating-valve 22 on a branch 23 from the pipe 13. Steam is always more or less fully supplied to the vjet 20, so that air will always be'passing through pipe 19 to keep it cool and at the same time supply the heated air forced through such pipe 19 by 'said steam-j et 2O to above the re on the bars 6, so as to promote combustion and more effectively burn up all -combustible particles given olfby'the fire.

In the modiiicatio'n illustrated in Fig. 2instead of the downtake-ll being a passage through the setting it consists of a series of pipes (if preferred, made of refractory material)24. The'pipes'19 (with steam-jets 20) 'and extensions are in duplicate, one in each corner of the chamber 10. All the other parts `are identical with those hereinbefore described and aremarked with similar figures of reference. The functions of the various parts and the operation of the whole of this modification will be readilyunderstood from the foregoing description with reference to Fig. 1.

It is to be understood that though it is admitted that the integersY making up these present improvements are of themselves separately not new, yet the new combination of them as a Whole now invented achieves in a more efficient and practical manner the prevention of the emission of smoke from the chimneys of such steam-generators as those setforth.

Having now particularly described and as- IOO certained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim isl. The combination of a furnace having an upright passage opening at its upper end into the atmosphere, a pipe connected With the lower end of said passage and extending for- Wardly therefrom, its forward end being situated under the grate and having a series of openings, an upright pipe substantially coextensive with said passage, the lower end of the pipe being provided with a forwardly-ex tending portion substantially coextensive with said other pipe and its forward or delivery end being situated above the grate, and means for delivering steam into the upper ends of said upright passage and upright pipe, respectively.

2. The combination of a furnace having brickwork, said brickwork being provided with a doWntake-'passage opening into the atmosphere at its upper end, a plurality of pipes leading from the doWntake-passage and extending forwardly therefrom, the forward ends of the pipes having openings for the discharge of air and steam at one side of the grate of said furnace, means for delivering steam into the upper open end of said downtake-passage, a pipe substantially coexten sive With the doWntake-passage and its upper end opening into the atmosphere, said pipe havinga forwardly-extendingportion,the end of which is arranged to discharge steam and air into the grate-chamber at the side of the grate opposite to that into which the air and steam from the first-mentioned pipes are delivered, and means for delivering steam into the upper open end of said pipe.

3. The combination of a furnace provided with a boiler and a steam-chamber, a Vertical passage opening into the atmosphere, and having a conduit extending forwardly from the same, and arranged to deliver air and steam into the grate-chamber of said furnace, and a system of valved piping arranged to deliver steam into the upper open end of said passage, and connected with said steamchamber.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

HERBERT ABBOTT.

Vitnesses:

FRED WALsH, PERCY NEWELL. 

